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Original Articles

Medición del insider trading en el mercado de valores español

Measuring insider trading in the Spanish stock market

Pages 115-136 | Received 20 Mar 2002, Accepted 19 Jul 2005, Published online: 15 Jan 2014
 

RESUMEN

El insider trading o uso de información privilegiada en el ejercicio de operaciones bursátiles es un tema de rotunda actualidad, tanto en el contexto de los mercados de valores como en el de la investigación financiera. Distintos episodios de reciente actualidad hacen más preciso conocer a fondo qué se entiende por insider trading y cómo prevenirlo. El presente trabajo trata de ofrecer mecanismos para medir la actividad negociadora de los insiders. Para ello se centra en el análisis de las distintas medidas recogidas en la literatura financiera para representar el insider trading, analizando su sentido y dando cifras para el mercado español de cara a conocer el verdadero comportamiento de los insiders en nuestro mercado. Se trata de la primera evidencia en este sentido para el mercado español, pero además ofrece algunas innovaciones respecto a los estudios para otros mercados. Nuestros resultados se expresan a favor del uso de mediciones del insider trading en las que el ratio volumen de compras menos ventas realizadas por insiders se estandariza por distintas variables, entre las que cabe destacar el tamaño de la empresa y el ratio beneficio por acción.

ABSTRACT

The insider trading has become a topic of major interest both in the context of the financial markets and financial research. Different episodes of recent actuality make necessary to deep into the analysis of both the insider trading and the ways of preventing it. The current study attempts to provide several mechanisms which may help us to measure the investing activity of insiders. For this purpose, it focuses on teh analysis of different insider tradign measurements produced in the in financial literature, it also helps us to interpret these signal and provide new figures on the behaviour of insiders in the Spanish markets. It represents Hie first evidence in this sense for our markets, but it also implies some innovations with respect to previous studies in other markets. Our results recommend the use of insider trading measurements on which the ratio of insiders purchases volume minus sales volume are standardised by different variables. Among those variables, we find the firm size and earning/share ratio.

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